Invalid document: cannot encode object: Characteristic

[vogt31337]

Hi,

encoding a pandapower.control.util.characteristic.Characteristic to BSON fails. Since saving and loading the corresponding grid model works, the JSON converter is working. Therefore this seems to be a problem in pandahub. It happened with a model which uses q_capability_characteristics for sgens.

Stacktrace:

2026-06-03 09:58:45,455 - ERROR - Invalid document: cannot encode object: Characteristic, of type: <class 'pandapower.control.util.characteristic.Characteristic'>
Traceback (most recent call last):
  File "async_mongo_api.py", line 250, in write_network
    await asyncio.gather(*coros)
  File "async_mongo_api.py", line 174, in _insert_many_with_semaphore
    return await collection.insert_many(data, ordered=False, bypass_document_validation=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\concurrent\futures\thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\_csot.py", line 125, in csot_wrapper
    return func(self, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\collection.py", line 975, in insert_many
    blk.execute(write_concern, session, _Op.INSERT)
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\bulk.py", line 751, in execute
    return self.execute_command(generator, write_concern, session, operation)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\bulk.py", line 604, in execute_command
    _ = client._retryable_write(
        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\mongo_client.py", line 2083, in _retryable_write
    return self._retry_with_session(retryable, func, s, bulk, operation, operation_id)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\mongo_client.py", line 1968, in _retry_with_session
    return self._retry_internal(
           ^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\_csot.py", line 125, in csot_wrapper
    return func(self, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\mvogt\miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\mongo_client.py", line 2014, in _retry_internal
    ).run()
      ^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\mongo_client.py", line 2763, in run
    return self._read() if self._is_read else self._write()
                                              ^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\mongo_client.py", line 2895, in _write
    return self._func(self._session, conn, self._retryable)  # type: ignore
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\bulk.py", line 593, in retryable_bulk
    self._execute_command(
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\bulk.py", line 538, in _execute_command
    result, to_send = self._execute_batch(bwc, cmd, ops, client)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\synchronous\bulk.py", line 461, in _execute_batch
    request_id, msg, to_send = bwc.batch_command(cmd, ops)
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\message.py", line 699, in batch_command
    request_id, msg, to_send = _do_batched_op_msg(
                               ^^^^^^^^^^^^^^^^^^^
  File "miniconda3\envs\cgmes\Lib\site-packages\pymongo\message.py", line 926, in _do_batched_op_msg
    return _batched_op_msg(operation, command, docs, ack, opts, ctx)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
bson.errors.InvalidDocument: Invalid document: cannot encode object: Characteristic, of type: <class 'pandapower.control.util.characteristic.Characteristic'>